US4900510A - High strength and corrosion resistant titanium alloy having excellent corrosion-wear properties - Google Patents

High strength and corrosion resistant titanium alloy having excellent corrosion-wear properties Download PDF

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Publication number
US4900510A
US4900510A US07/181,215 US18121588A US4900510A US 4900510 A US4900510 A US 4900510A US 18121588 A US18121588 A US 18121588A US 4900510 A US4900510 A US 4900510A
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corrosion
sup
strength
titanium alloy
wear
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US07/181,215
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Misao Ishikawa
Yohji Kohsaka
Chiaki Ouchi
Katsumi Masamura
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JFE Engineering Corp
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Nippon Kokan Ltd
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Assigned to NIPPON KOKAN KABUSHIKI KAISHA reassignment NIPPON KOKAN KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ISHIKAWA, MISAO, KOHSAKA, YOHJI, MASAMURA, KATSUMI, OUCHI, CHIAKI
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium

Definitions

  • the present invention relates to high strength and corrosion resistant titanium alloy having excellent corrosion-wear properties.
  • Al and Mo are added as alloying elements in specific amounts for providing the excellent strength, the corrosion-wear resistant properties and hot workability.
  • Titanium and titanium alloys have excellent corrosion resistance against chloride solution, and are broadly used as structural materials against seawater environments, chemical plants and others. On the other hand, crevice corrosion easily occurs in the chloride solution at high temperature, and this fact limits use of titanium materials.
  • Ti-0.2%Pd alloy and Ti-0.8%Ni-0.3%Mo alloy have been developed in this respect (Japanese Patent Application Laid Open No. 130,614/75), are now utilized. However these titanium alloys are lower in strength than Ti-6Al-4V alloy which has been most widely used as high strength titanium alloy, and the titanium alloys are accordingly restricted with respect to application to parts requiring high strength.
  • titanium alloy is more satisfied with corrosion and stress corrosion resistant characteristics in the chloride environments than stainless steels and Co-Cr-Mo alloys, and further advantageously it does not contain harmful elements to human bodies such as Ni, Co and Cr.
  • Ti-6 Al-4V (ELI) has been commercialized. But this kind of titanium alloy could not be satisfied with the corrosion resistance and corrosion-wear properties, and its toxicity in the human bodies is pointed out.
  • the corrosion-wear properties is referred to concerning the wear of the material applied to hip prosthesis in the human bodies under the corrosion environment, and this characteristic is important in this kind of the application, since powders resulting from wear are harmful to the tissue of the human bodies.
  • titanium alloy is inferior in the wear resistant properties than stainless steel (SUS 316L) and Co-Cr-Mo alloy already used as the hip prosthesis.
  • the corrosion resistance could be improved in Ti-0.2Pd alloy and Ti-0.8Ni-0.3Mo alloy, while the strength is still required.
  • the corrosion resistance and the corrosion-wear properties are inferior in Ti-6Al-4V (ELI) of the high tensile titanium alloy.
  • the present invention has been conducted in view of the existing problems, and it is an object of the invention to provide a high strength and corrosion resistant titanium alloy which has the equivalent strength to that of Ti-6Al-4V (ELI) alloy and especially which could well satisfy the corrosion-wear property and suitability to the human body.
  • ELI Ti-6Al-4V
  • the invention specifies the chemical composition of Al: 3.0 to 6.0 wt%, Mo: more than 1.5 wt% to less than 3.0 wt%, and the balance being Ti and unavoidable impurities.
  • This invention could further add Zr: 2.0 to 6.0 wt%, thereby to more improve the strength and the corrosion-wear properties.
  • the sole FIGURE shows influences of Mo contents to the hot workability (reduction of area).
  • the inventors designed as follows the titanium alloy which could satisfy the above mentioned characteristics.
  • a microstructure For providing the titanium alloy which has the high strength and is balanced with strength and ductility, a microstructure consists of ⁇ + ⁇ structure for which Al and Mo are added, Al being ⁇ phase stabilizing element, and Mo being ⁇ phase stabilizing element.
  • the ⁇ + ⁇ structure is stable at room temperature.
  • Al and Mo greatly attribute to the strength, but Al of more than 8 wt% forms a brittle phase called ⁇ 2 and deteriorates mechanical properties.
  • Mo is effective to the corrosion resistance and the crevice corrosion resistance. Zr could increase precipitation of ⁇ 2 and enhance the strength without deteriorating the ductility and the corrosion resistance.
  • the present invention expels alloying elements such as Ni, Co, Cr, V considered to be harmful to the human body, and employs Ti-Al-Mo alloys and Ti-Al-Mo-Zr alloys suitable to the human body by a tissue reaction test. This fact takes into account application to the material for the human body such as the hip prosthesis and has an effect to improving of the corrosion-wear properties by addition of Mo and Zr.
  • Al is ⁇ phase stabilizing element for providing an ⁇ + ⁇ phase at a heating temperature about 920° C., and attributes to increasing of the strength without deteriorating the corrosion resistance.
  • a content of less than 3.0 wt% is insufficient to obtain a desired strength, while more than 6.0 wt% causes ⁇ 2 phase to precipitate and deteriorate the tensile property. So, Al is determined to be 3.0 to 6.0 wt%.
  • Mo is ⁇ phase stabilizing element, and broadens the range of the ⁇ + ⁇ phase at a heating temperature about 920° C. and brings about equiaxed ⁇ structure having well strength and ductility. Mo is solute in titanium and attributes to strengthening. In addition, it is effective to the corrosion resistance and the crevice corrosion resistance. The corrosion-wear property is also improved by addition of Mo. A content of less than 1.5 wt% is insufficient to obtain a desired strength and the corrosion-wear property.
  • the Mo content is determined to be more than 1.5 wt% to less than 3.0 wt%.
  • Zr is a ⁇ phase stabilizing element, and it does not have a strengthening effect to an extent of Mo but increases strength without lowering ductility, and does not deteriorate the corrosion resistance. Further, the corrosion-wear property is improved. A content of less than 2.0 wt% is insufficient to obtain a desired strength and an effect of improving corrosion-wear property. More than 6.0 wt% would not bring about a desired effect. Therefore, the Zr content is determined to be 2.0 to 6.0 wt%.
  • a button ingot was prepared in an Ar arc furnace, forged and hot-rolled to a plate having thickness of 10 mm. Subsequently the plate was subjected to a recrystallization annealing at a temperature of ⁇ + ⁇ heating range, a tensile test, a corrosion-wear test, a polarization characteristic test, a crevice corrosio test, and a tensile test at high speed and high temperature.
  • the corrosion-wear test was carried out by a pin-on-disk type testing machine by wearing in the solution of 0.9% NaCl at 36.5° C. Pins were machined out from each of the alloy plates, and the worn parts were spherical.
  • the disk was made of a high density polyethylene (HDP).
  • HDP high density polyethylene
  • the tensile tests at high speed and high temperature were performed in that those test pieces of the size of 6.0 mm ⁇ 16 mm after heating at 850° C. in a high frequency induction heating apparatus were subjected to the tensile test at 10 S -1 , strain rate, and the hot workability was evaluated by reduction of area. Results are shown in Table 1.
  • the tensile properties of the inventive examples show tensile strength of more than 65 Kgf/mm 2 and desirable balances of strength and ductility of more than 15% (E1).
  • the specific abrasion weight is not more than 1 ⁇ 10 -10 (mm 2 /Kg) being lower than the comparison examples. Especially, it is lower than Ti-6Al-4V (ELI), and the effects of the present invention are well revealed.
  • the inventive alloy has strength equivalent to that of Ti-6Al-4V alloy, and the corrosion-wear resistance and the hot workability superior thereto. It is possible to apply, as the high strength corrosion resistant titanium alloy, to industrial usage such as the hip-prosthesis of human body or the corrosion resistant material for the ocean environment.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Materials For Medical Uses (AREA)
  • Powder Metallurgy (AREA)
  • Lubricants (AREA)
  • Conductive Materials (AREA)
  • Prevention Of Electric Corrosion (AREA)
US07/181,215 1987-04-22 1988-04-13 High strength and corrosion resistant titanium alloy having excellent corrosion-wear properties Expired - Fee Related US4900510A (en)

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JP9757587 1987-04-22
JP62-97575 1987-04-22

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US4900510A true US4900510A (en) 1990-02-13

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CH (1) CH675255A5 (enrdf_load_html_response)
DE (1) DE3813667C2 (enrdf_load_html_response)
FR (1) FR2616448B1 (enrdf_load_html_response)
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IT (1) IT1219553B (enrdf_load_html_response)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090162635A1 (en) * 2004-11-18 2009-06-25 Mitsubishi Materials Corporation Composite porous metal body and method for manufacturing the same
CN111394616A (zh) * 2020-04-26 2020-07-10 西安交通大学 一种Ti-Al-Zr-Cr系马氏体钛合金及其制备方法
CN112176219A (zh) * 2020-09-28 2021-01-05 哈尔滨工业大学 一种Ti-Al-Nb-Zr-Mo耐腐蚀钛合金及其制备方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990007016A1 (en) * 1988-12-19 1990-06-28 Barry Mollenhauer Orthodontic treatment
FR2752287B1 (fr) * 1996-08-07 1998-10-09 Sagem Dispositif de liaison a temperature cryogenique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3540946A (en) * 1964-12-23 1970-11-17 Imp Metal Ind Kynoch Ltd Titanium-base alloys
US3666453A (en) * 1969-09-24 1972-05-30 Imp Metal Ind Kynoch Ltd Titanium-base alloys
US4634478A (en) * 1984-08-13 1987-01-06 Kabushiki Kaisha Kobe Seiko Sho Titanium molybdenum alloy superior in resistance to pitting corrosion in bromide ion environment
US4737341A (en) * 1986-04-18 1988-04-12 Imi Titanium Limited Titanium-base alloys

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2554031A (en) * 1949-10-20 1951-05-22 Remington Arms Co Inc Titanium base alloy
US2596485A (en) * 1950-12-02 1952-05-13 Remington Arms Co Inc Titanium base alloy
GB757413A (en) * 1953-12-30 1956-09-19 British Non Ferrous Metals Res Titanium alloys and their application
GB782148A (en) * 1954-10-27 1957-09-04 Armour Res Found Improvements in and relating to the heat treatment of titanium alloys
US3113227A (en) * 1960-03-21 1963-12-03 Crucible Steel Co America Titanium alloy articles resistant to hydrogen absorption for dynamoelectric machines
US3457068A (en) * 1965-04-19 1969-07-22 Titanium Metals Corp Titanium-base alloys
GB1079416A (en) * 1965-07-14 1967-08-16 Imp Metal Ind Kynoch Ltd Titanium-base alloys
US3370946A (en) * 1965-09-21 1968-02-27 Reactive Metals Inc Titanium alloy
GB1161657A (en) * 1967-05-16 1969-08-20 Contimet Gmbh Titanium Base Alloy
GB1298923A (en) * 1970-01-13 1972-12-06 Imp Metal Ind Kynoch Ltd Titanium-base alloys
US4040129A (en) * 1970-07-15 1977-08-09 Institut Dr. Ing. Reinhard Straumann Ag Surgical implant and alloy for use in making an implant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3540946A (en) * 1964-12-23 1970-11-17 Imp Metal Ind Kynoch Ltd Titanium-base alloys
US3666453A (en) * 1969-09-24 1972-05-30 Imp Metal Ind Kynoch Ltd Titanium-base alloys
US4634478A (en) * 1984-08-13 1987-01-06 Kabushiki Kaisha Kobe Seiko Sho Titanium molybdenum alloy superior in resistance to pitting corrosion in bromide ion environment
US4737341A (en) * 1986-04-18 1988-04-12 Imi Titanium Limited Titanium-base alloys

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090162635A1 (en) * 2004-11-18 2009-06-25 Mitsubishi Materials Corporation Composite porous metal body and method for manufacturing the same
CN101056759B (zh) * 2004-11-18 2011-12-14 三菱麻铁里亚尔株式会社 复合金属多孔体及其制造方法
CN111394616A (zh) * 2020-04-26 2020-07-10 西安交通大学 一种Ti-Al-Zr-Cr系马氏体钛合金及其制备方法
CN111394616B (zh) * 2020-04-26 2021-10-08 西安交通大学 一种Ti-Al-Zr-Cr系马氏体型钛合金的制备方法
CN112176219A (zh) * 2020-09-28 2021-01-05 哈尔滨工业大学 一种Ti-Al-Nb-Zr-Mo耐腐蚀钛合金及其制备方法

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Publication number Publication date
FR2616448B1 (fr) 1995-02-17
GB2203755A (en) 1988-10-26
SE8801476L (sv) 1988-10-23
SE8801476D0 (sv) 1988-04-21
IT1219553B (it) 1990-05-18
GB2203755B (en) 1991-08-14
DE3813667C2 (de) 1997-02-20
FR2616448A1 (fr) 1988-12-16
CH675255A5 (enrdf_load_html_response) 1990-09-14
IT8847885A0 (it) 1988-04-22
DE3813667A1 (de) 1988-11-03
GB8808961D0 (en) 1988-05-18

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